"Into The Wild" Three similarities in personality did Chris and his sister, Carine share? How is her relationship with their parents?

From the text:

Standing five feet eight inches tall, Carine McCandless is the same height as her brother was, maybe an inch taller, and looks enough like him that people frequently asked if they were twins.

Like Chris, Carine is energetic and self-assured, a high achiever, quick to state an opinion. Also like Chris, she clashed fiercely with Walt and Billie as an adolescent.